Standardization and quantification of radionuclide solid gastric-emptying studies.

Area of Science:

• Nuclear Medicine
• Gastroenterology
• Medical Imaging

Background:

• Gastric emptying studies are crucial for diagnosing gastrointestinal motility disorders.
• Standardized and validated methods are needed for reliable radionuclide solid gastric emptying assessments.
• Existing methods may not be universally applicable to all gamma-camera systems.

Purpose of the Study:

• To standardize and validate a simple quantitative method for radionuclide solid gastric emptying.
• To ensure the method's applicability to any dual-head gamma-camera.
• To establish reliable reference values for gastric emptying.

Main Methods:

• A solid meal (egg sandwich) labeled with a radionuclide was administered to 20 healthy volunteers.
• A 90-minute gastric emptying study was performed using a triple-head gamma-camera with sequential projections.
• Time-activity curves were generated using geometric mean (GM) data from various camera views.

Main Results:

• The anterior/posterior GM method yielded higher %GE reference values (>=33%) compared to other GM methods.
• High correlation coefficients (r >= 0.874) were observed among different GM quantification methods.
• No statistically significant differences were found between most GM quantification methods, indicating reliability.

Conclusions:

• A simple, validated radionuclide solid gastric emptying method for dual-head gamma-cameras has been developed.
• The anterior/posterior GM method is recommended for its simplicity and reliability.
• Reference values (>=33% GE at 90 min) have been established for this method.